Add --no-vd-system-decorations

Add an option to disable the following flag for virtual displays:

    DisplayManager.VIRTUAL_DISPLAY_FLAG_SHOULD_SHOW_SYSTEM_DECORATIONS

Some devices render a broken UI when this flag is enabled.

app/data/bash-completion/scrcpy

@@ -57,6 +57,7 @@ _scrcpy() {
         --no-mipmaps
         --no-mouse-hover
         --no-power-on
+        --no-vd-system-decorations
         --no-video
         --no-video-playback
         --orientation=

app/data/zsh-completion/_scrcpy

@@ -63,6 +63,7 @@ arguments=(
     '--no-mipmaps[Disable the generation of mipmaps]'
     '--no-mouse-hover[Do not forward mouse hover events]'
     '--no-power-on[Do not power on the device on start]'
+    '--no-vd-system-decorations[Disable virtual display system decorations flag]'
     '--no-video[Disable video forwarding]'
     '--no-video-playback[Disable video playback]'
     '--orientation=[Set the video orientation]:orientation values:(0 90 180 270 flip0 flip90 flip180 flip270)'

app/scrcpy.1

@@ -372,6 +372,10 @@ Do not forward mouse hover (mouse motion without any clicks) events.
 .B \-\-no\-power\-on
 Do not power on the device on start.
 
+.TP
+.B \-\-no\-vd\-system\-decorations
+Disable virtual display system decorations flag.
+
 .TP
 .B \-\-no\-video
 Disable video forwarding.

app/src/cli.c

@@ -109,6 +109,7 @@ enum {
     OPT_SCREEN_OFF_TIMEOUT,
     OPT_CAPTURE_ORIENTATION,
     OPT_ANGLE,
+    OPT_NO_VD_SYSTEM_DECORATIONS,
 };
 
 struct sc_option {
@@ -660,6 +661,11 @@ static const struct sc_option options[] = {
         .longopt = "no-power-on",
         .text = "Do not power on the device on start.",
     },
+    {
+        .longopt_id = OPT_NO_VD_SYSTEM_DECORATIONS,
+        .longopt = "no-vd-system-decorations",
+        .text = "Disable virtual display system decorations flag.",
+    },
     {
         .longopt_id = OPT_NO_VIDEO,
         .longopt = "no-video",
@@ -2702,6 +2708,9 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
             case OPT_ANGLE:
                 opts->angle = optarg;
                 break;
+            case OPT_NO_VD_SYSTEM_DECORATIONS:
+                opts->vd_system_decorations = optarg;
+                break;
             default:
                 // getopt prints the error message on stderr
                 return false;

app/src/options.c

@@ -108,6 +108,7 @@ const struct scrcpy_options scrcpy_options_default = {
     .new_display = NULL,
     .start_app = NULL,
     .angle = NULL,
+    .vd_system_decorations = true,
 };
 
 enum sc_orientation

app/src/options.h

@@ -310,6 +310,7 @@ struct scrcpy_options {
     bool audio_dup;
     const char *new_display; // [<width>x<height>][/<dpi>] parsed by the server
     const char *start_app;
+    bool vd_system_decorations;
 };
 
 extern const struct scrcpy_options scrcpy_options_default;

app/src/scrcpy.c

@@ -458,6 +458,7 @@ scrcpy(struct scrcpy_options *options) {
         .power_on = options->power_on,
         .kill_adb_on_close = options->kill_adb_on_close,
         .camera_high_speed = options->camera_high_speed,
+        .vd_system_decorations = options->vd_system_decorations,
         .list = options->list,
     };
 

app/src/server.c

@@ -376,6 +376,9 @@ execute_server(struct sc_server *server,
         VALIDATE_STRING(params->new_display);
         ADD_PARAM("new_display=%s", params->new_display);
     }
+    if (!params->vd_system_decorations) {
+        ADD_PARAM("vd_system_decorations=false");
+    }
     if (params->list & SC_OPTION_LIST_ENCODERS) {
         ADD_PARAM("list_encoders=true");
     }

app/src/server.h

@@ -69,6 +69,7 @@ struct sc_server_params {
     bool power_on;
     bool kill_adb_on_close;
     bool camera_high_speed;
+    bool vd_system_decorations;
     uint8_t list;
 };
 

doc/virtual_display.md

@@ -24,3 +24,13 @@ For example:
 ```bash
 scrcpy --new-display=1920x1080 --start-app=org.videolan.vlc
 ```
+
+## System decorations
+
+By default, virtual display system decorations are enabled. But some devices
+might display a broken UI;
+
+Use `--no-vd-system-decorations` to disable it.
+
+Note that if no app is started, no content will be rendered, so no video frame
+will be produced at all.

server/src/main/java/com/genymobile/scrcpy/Options.java

@@ -60,6 +60,7 @@ public class Options {
     private boolean powerOn = true;
 
     private NewDisplay newDisplay;
+    private boolean vdSystemDecorations = true;
 
     private Orientation.Lock captureOrientationLock = Orientation.Lock.Unlocked;
     private Orientation captureOrientation = Orientation.Orient0;
@@ -232,6 +233,10 @@ public class Options {
         return captureOrientationLock;
     }
 
+    public boolean getVDSystemDecorations() {
+        return vdSystemDecorations;
+    }
+
     public boolean getList() {
         return listEncoders || listDisplays || listCameras || listCameraSizes || listApps;
     }
@@ -461,6 +466,9 @@ public class Options {
                 case "new_display":
                     options.newDisplay = parseNewDisplay(value);
                     break;
+                case "vd_system_decorations":
+                    options.vdSystemDecorations = Boolean.parseBoolean(value);
+                    break;
                 case "capture_orientation":
                     Pair<Orientation.Lock, Orientation> pair = parseCaptureOrientation(value);
                     options.captureOrientationLock = pair.first;

server/src/main/java/com/genymobile/scrcpy/video/NewDisplayCapture.java

@@ -53,6 +53,7 @@ public class NewDisplayCapture extends SurfaceCapture {
     private final boolean captureOrientationLocked;
     private final Orientation captureOrientation;
     private final float angle;
+    private final boolean vdSystemDecorations;
 
     private VirtualDisplay virtualDisplay;
     private Size videoSize;
@@ -72,6 +73,7 @@ public class NewDisplayCapture extends SurfaceCapture {
         this.captureOrientation = options.getCaptureOrientation();
         assert captureOrientation != null;
         this.angle = options.getAngle();
+        this.vdSystemDecorations = options.getVDSystemDecorations();
     }
 
     @Override
@@ -158,8 +160,10 @@ public class NewDisplayCapture extends SurfaceCapture {
                     | VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY
                     | VIRTUAL_DISPLAY_FLAG_SUPPORTS_TOUCH
                     | VIRTUAL_DISPLAY_FLAG_ROTATES_WITH_CONTENT
-                    | VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL
-                    | VIRTUAL_DISPLAY_FLAG_SHOULD_SHOW_SYSTEM_DECORATIONS;
+                    | VIRTUAL_DISPLAY_FLAG_DESTROY_CONTENT_ON_REMOVAL;
+            if (vdSystemDecorations) {
+                flags |= VIRTUAL_DISPLAY_FLAG_SHOULD_SHOW_SYSTEM_DECORATIONS;
+            }
             if (Build.VERSION.SDK_INT >= AndroidVersions.API_33_ANDROID_13) {
                 flags |= VIRTUAL_DISPLAY_FLAG_TRUSTED
                         | VIRTUAL_DISPLAY_FLAG_OWN_DISPLAY_GROUP